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-rw-r--r--src/newgrf_engine.cpp28
1 files changed, 28 insertions, 0 deletions
diff --git a/src/newgrf_engine.cpp b/src/newgrf_engine.cpp
index 80e249710..5dd020f61 100644
--- a/src/newgrf_engine.cpp
+++ b/src/newgrf_engine.cpp
@@ -652,6 +652,34 @@ static uint32 VehicleGetVariable(Vehicle *v, const ResolverObject *object, byte
}
return 0;
+ case 0x62: { // Curvature/position difference for n-th vehicle in chain [signed number relative to vehicle]
+ /* Format: zzyyxxFD
+ * zz - Signed difference of z position between the selected and this vehicle.
+ * yy - Signed difference of y position between the selected and this vehicle.
+ * xx - Signed difference of x position between the selected and this vehicle.
+ * F - Flags, bit 7 corresponds to VS_HIDDEN.
+ * D - Dir difference, like in 0x45.
+ */
+ if (!v->IsGroundVehicle()) return 0;
+
+ const Vehicle *u = v->Move((int8)parameter);
+ if (u == NULL) return 0;
+
+ /* Get direction difference. */
+ bool prev = (int8)parameter < 0;
+ uint32 ret = prev ? DirDifference(u->direction, v->direction) : DirDifference(v->direction, u->direction);
+ if (ret > DIRDIFF_REVERSE) ret |= 0x08;
+
+ if (u->vehstatus & VS_HIDDEN) ret |= 0x80;
+
+ /* Get position difference. */
+ ret |= ((prev ? u->x_pos - v->x_pos : v->x_pos - u->x_pos) & 0xFF) << 8;
+ ret |= ((prev ? u->y_pos - v->y_pos : v->y_pos - u->y_pos) & 0xFF) << 16;
+ ret |= ((prev ? u->z_pos - v->z_pos : v->z_pos - u->z_pos) & 0xFF) << 24;
+
+ return ret;
+ }
+
case 0xFE:
case 0xFF: {
uint16 modflags = 0;